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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82621423044bf31a2d0ec48ac7b746f3c95934c6dfaa4095614d359376e5f9f1' 
  AND token = 'tXQl/XSRP39ILmBAzRjk8uFrRyv1cLtN1VH2upC7rl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}